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Tubular coils for steam application are somewhat different in design than coils for liquid flow, especially in the placing of baffles inside the manifolds. The main concern is to ensure that the entire coil is being used as a steam heat exchanger, and that part of the coil is not permanently flooded with condensate. This can be achieved by limiting the size of the tubular in-tank heat exchanger to a heat transfer surface area of 25 square feet. If more than 25 square feet of surface area is required in a specific application, grid coil should be divided into several individual heat transfer zones, with none of the zones exceeding 25 square feet. Through strategically placed baffles and sectional inlet arrangements the unit becomes a multi-zoned heat exchanger, and condensate rejected from the unit through a single return pipe.
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